package cn.campusshop.common.utils;

import io.jsonwebtoken.Claims;
import io.jsonwebtoken.JwtBuilder;
import io.jsonwebtoken.Jwts;
import io.jsonwebtoken.SignatureAlgorithm;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.stereotype.Component;

import java.util.Date;

/**
 * @author zhulang
 * @Classname JwtUtil
 * @Description JwtUtil
 */
@Component
@ConfigurationProperties("jwt.config")
public class JwtUtil {
    private String key;
    private long ttl;

    public String getKey() {
        return key;
    }

    public void setKey(String key) {
        this.key = key;
    }

    public long getTtl() {
        return ttl;
    }

    public void setTtl(long ttl) {
        this.ttl = ttl;
    }

    /**
     * 生成JWT
     *
     * @param id
     * @param subject
     * @param roles
     * @return
     */
    public String createJWT(String id, String subject, String roles,Object obj) {
        long nowMillis = System.currentTimeMillis();
        Date now = new Date(nowMillis);
        JwtBuilder builder = Jwts.builder().setId(id).setSubject(subject).setIssuedAt(now).signWith(SignatureAlgorithm.HS256, key)
                .claim("roles", roles).claim("user", obj);
        if (ttl > 0) {
//            设置过期时间
            builder.setExpiration(new Date(nowMillis + ttl));
        }
        return builder.compact();
    }

    /**
     * 解析JWT
     *
     * @param jwtStr
     * @return
     */
    public Claims parseJWT(String jwtStr) {
        return Jwts.parser().setSigningKey(key).parseClaimsJws(jwtStr).getBody();
    }
}
